Mel Greig and Michael Christian could be charged by Australian police (Picture: AFP/Getty)

Two DJs who were involved in a prank on a hospital taking care of the pregnant Duchess of Cambridge could face criminal action after the Metropolitan police confirmed they had asked Australian authorities to consider charges.

Mel Greig and Michael Christian could be prosecuted along with the station they were working for, Australian radio station 2Day FM, after they tricked a nurse into revealing information about Kate Middleton, who was suffering from severe morning sickness at the time.

Nurse Jacintha Saldanha, who put the presenters through to a colleague after they pretended to be Queen Elizabeth and Prince Charles, later killed herself and reportedly wrote in a suicide note the prank was partly to blame.